Found a factor? Post it here.

[James Heinrich]

Originally Posted by LordJulius

Why skip TF 2^79 to 2^80 ?

He probably did it, but since it now shows up as a TF gap I re-did it:
no factor for M333333493 from 2^79 to 2^80 [mfaktc 0.21 barrett87_mul32_gs]
tf(): total time spent: 44m 8.503s

Originally Posted by kriesel

DC avoided, and with a ~106. bit factor found

Or, formatted:

M106971629 has a 105.971-bit (32-digit) factor: 79534574109359138908214691895351 (P-1,B1=582000,B2=190186920)
k = 3^2 * 5^2 * 7 * 233 * 953 * 1901 * 4643 * 120433463

[Jwb52z]

P-1 found a factor in stage #2, B1=501000, B2=16987500.
UID: Jwb52z/Clay, M117383251 has a factor: 4607805263510756479738961 (P-1, B1=501000, B2=16987500)

81.930 bits.

[Miszka]

I found 4 factors: sixth (254707775084069984279 - 67.8 bits); seventh (1026695470153012861417 - 69.8 bits); eighth (8651909121526379308519 - 72.9 bits) and ninth (29616184428737548369319 - 74.6 bits) for M662869847

[James Heinrich]

Originally Posted by Miszka

I found 4 factors

Nice! The smallest one would've been found in a few weeks by TJAOI, but you got there first.


Outside GIMPS range, but I recently found 3 factors for M4267897171 within 0.85 bits of each other:
73.915-bit M4267897171 has a factor: 17807676876562259133311
74.723-bit M4267897171 has a factor: 31174335411508659346271
74.765-bit M4267897171 has a factor: 32092274269846547707271